Android计时器
16lz
2021-01-23
private Handler handler = new Handler(){ public void handleMessage(Message msg) { super.handleMessage(msg); //满足条件要执行的内容 if(msg.what == 1&&msg.arg1 == 0){ // Log.v(TAG, "计时器"); if(todoNum != 0){ todoDocNumTV.setVisibility(View.VISIBLE); todoDocNumTV.setText(todoNum+""); isRefresh = 1; } } }}; private Timer timer = new Timer(true); //任务private TimerTask task = new TimerTask() { public void run() { Message msg = new Message(); msg.what = 1; msg.arg1 = isRefresh; handler.sendMessage(msg); }}; 启动计时器
//启动定时器timer.schedule(task, 0, 1*1000);
当我想停止计时器再重启是遇到一个问题，报错ava.lang.IllegalStateException: TimerTask is scheduled already
发现每根TimerTask只能执行一次schedule
所以只能在重启之前清空之前的任务并重新赋值，然后再启动
if(task != null){task.cancel(); //将原任务从队列中移除}task = new TimerTask() { public void run() { Message msg = new Message(); msg.what = 1; msg.arg1 = 0; handler.sendMessage(msg); }};//启动定时器timer.schedule(task, 0, 1*1000);